The Bleachers

"A relatively common disease of HIV positive gay men (rarely heterosexual women) who practice both receptive anal sex and oral sex ("ATM" sex) with multiple partners. The condition is characterized by an inflammed, fissured, atonic, and supporating rectum. Symptoms include diarrhea, sanguinomucopurulent rectal discharge, rectal pain and itching, and abdominal cramps. The cause is multiple concurrent infections of the colon and a traumatized rectum with intestinal parasites (worms), protozoans, bacteria, and occasionally fungi. The disease is contagious within the susceptable population of ATM practitioners and transmitted via the fecal-oral route."

And guess what? Homosexuality shortens life span by 20-30 years:

http://www.ncbi.nlm.nih.gov/pubmed/9923159

Who would have thought that running a biowarfare lab in your ass is detrimental to your health?